<template>
	<view>
		<view class="search-box">
			<uni-search-bar cancelButton="none" :radius="100"  @input="input"></uni-search-bar>
		</view>
		
		<!-- //搜索栏 -->
		<view class="sugg-list" v-if="searchResults.length !==0">
			<view @click="gotoDetail(item)" class="sugg-item" v-for="(item,i) in searchResults" :key="i">
				<view class="goods-name">{{item.goods_name}}</view>
				<uni-icons type="arrowright" size="16"></uni-icons>
			</view>
		</view>
		<!-- 搜索历史 -->
		<view class="history-box" v-else>
			<!-- 标题 -->
			<view class="history-title">
				<text>搜索历史</text>
				<uni-icons  @click="clean"  type="trash" size="17"></uni-icons>
			</view>
			<!-- 列表 -->
			<view class="history-list">
				<uni-tag @click="gotoGoodsList(item)"  :text="item" v-for="(item,i) in histories" :key="i"></uni-tag>
			</view>
		</view>
	</view>
</template>

<script>
	export default {
		data() {
			return {
				timer:null,
				kw:'',
				//搜索结果
				searchResults:[],
				historyList:[]
			};
		},
		onLoad() {
			//json.parse转为真正的数组
			this.historyList=JSON.parse(uni.getStorageSync('kw') || '[]')	
		},
		computed:{
			histories(){
				//注意：由于数组是引用类型，所以不要直接基于原数组调用reverse方法，以免修改原数组中元素的顺序				//而是应该新建一个内存无关的数组，再进行reverse反转
				return [...this.historyList].reverse()//reverse方法会把数组进行翻转
			}
		},
		methods:{
			gotoDetail(item){
				console.log(item)
				uni.navigateTo({
					url:'/subpkg/goods_detail/goods_detail?goods_id='+item.goods_id
				})
			},
			//搜索框输入事件
			input(e){
				clearTimeout(this.timer)
				this.timer=setTimeout(()=>{
					this.kw = e
					
					this.getSearchList()
					
				},500)
			},
			async getSearchList(){
				if(this.kw.length === 0){
					this.searchResults=[]
					console.log('1')
					return
					
				}
				const {data:res} = await uni.$http.get('/api/public/v1/goods/qsearch',{query:this.kw})
				
				if(res.meta.status!==200) return uni.$showMsg()
				this.searchResults=res.message
				this.saveSearchHistory()
			},
			saveSearchHistory(){//保存搜索历史记录
				// this.historyList.push(this.kw)
				const set=new Set(this.historyList)//数组去重
				//移除旧元素 a
				set.delete(this.kw)
				//重新追加一个新元素 a
				set.add(this.kw)
				//set是对象来的 要转换为数组
				this.historyList=Array.from(set)//转换数组 返回值是新数组
				
				
				//持久化存储 把数组转为string类型
				uni.setStorageSync('kw',JSON.stringify(this.historyList))
			},
			clean(){
				this.historyList=[]
				uni.setStorageSync('kw','[]')
			},
			gotoGoodsList(kw){
				uni.navigateTo({
					url:'/subpkg/goods_list/goods_list?query='+kw
				})
			}
		},
		
	}
</script>

<style lang="scss">
.search-box{
	position: sticky;
	top: 0;
	z-index: 999;
}
.sugg-list{
	padding: 0 5px;
	.sugg-item{
		display: flex;
		align-items: center;
		justify-content: space-between;
		font-size: 12px;
		padding: 13px 0;
		border-bottom: 1px solid #efefef;
		.goods-name{
			white-space: nowrap;
			overflow: hidden;
			text-overflow: ellipsis;
		}
	}
}
.history-box{
	padding: 0 5px;
	.history-title{
		display: flex;
		justify-content: space-between;
		height: 40px;
		align-items: center;
		font-size: 13px;
		border-bottom: 1px solid #efefef;
	}
	.history-list{
		display: flex;
		flex-wrap: wrap;
		.uni-tag{
			margin-top: 5px;
			margin-right: 5px;
		}
	}
}
</style>
